The reasons can be sought in the fact that parents usually decide for themselves that the child will remain with the mother, and also that it is extremely difficult for judges and social workers to decide that the child should live with the father.
Ello se explica porque son los padres normalmente quienes deciden que el niño se quede con la madre, y también porque es sumamente difícil para los jueces y asistentes sociales decidir que el niño viva con su padre.